JP6565873B2 - Sealed battery - Google Patents

Sealed battery Download PDF

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JP6565873B2
JP6565873B2 JP2016225912A JP2016225912A JP6565873B2 JP 6565873 B2 JP6565873 B2 JP 6565873B2 JP 2016225912 A JP2016225912 A JP 2016225912A JP 2016225912 A JP2016225912 A JP 2016225912A JP 6565873 B2 JP6565873 B2 JP 6565873B2
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current collecting
reversing plate
collecting terminal
convex portion
exterior body
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JP2018085178A (en
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直人 各務
直人 各務
友寛 大野
友寛 大野
智生 萩野
智生 萩野
洋一 成瀬
洋一 成瀬
雄太 根本
雄太 根本
才昇 大倉
才昇 大倉
海人 松原
海人 松原
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Toyota Motor Corp
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Toyota Motor Corp
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Priority to JP2016225912A priority Critical patent/JP6565873B2/en
Priority to CN201711136411.3A priority patent/CN108091814B/en
Priority to US15/814,753 priority patent/US10381631B2/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Description

この発明は、一般的には、密閉型電池に関し、より特定的には、電流遮断機構（ＣＩＤ：Current Interrupt Device）を備える密閉型電池に関する。   The present invention generally relates to a sealed battery, and more particularly to a sealed battery including a current interrupt device (CID).

従来の密閉型電池に関して、たとえば、特開２０１５−６０７５１号公報には、電流遮断機構が作動したことを外部から認識可能とすることを目的とした、二次電池が開示されている（特許文献１）。   Regarding a conventional sealed battery, for example, Japanese Patent Laying-Open No. 2015-60751 discloses a secondary battery for the purpose of making it possible to recognize from the outside that a current interrupting mechanism has been activated (Patent Document). 1).

特許文献１に開示された二次電池は、電流遮断機構および感圧部材を備える。電流遮断機構は、二次電池の外部側に開口を有する接続端子と、接続端子に接続される反転板とを有する。感圧部材は、接続端子の開口を封止するように設けられている。反転板と接続端子とで囲まれた空間の圧力の上昇に応じて、感圧部材の状態が変化する。   The secondary battery disclosed in Patent Document 1 includes a current interruption mechanism and a pressure sensitive member. The current interrupt mechanism includes a connection terminal having an opening on the outside of the secondary battery, and an inversion plate connected to the connection terminal. The pressure sensitive member is provided so as to seal the opening of the connection terminal. The state of the pressure-sensitive member changes according to an increase in pressure in the space surrounded by the reversing plate and the connection terminal.

また、特開２０１６−９６０１４号公報には、電池容器の内圧上昇に伴って変形して、外部端子と電池容器内の巻回電極群との間の電流経路を遮断するダイヤフラムと、その電流経路を構成する部材との間の溶接品質を向上させることを目的とした、二次電池が開示されている（特許文献２）。   JP-A-2006-96014 discloses a diaphragm that is deformed as the internal pressure of the battery container increases and blocks the current path between the external terminal and the wound electrode group in the battery container, and the current path A secondary battery has been disclosed for the purpose of improving the quality of welding with a member constituting the battery (Patent Document 2).

特許文献２に開示された二次電池においては、ダイヤフラムが、電流経路を構成する部材に溶接される部分の肉厚が、内圧上昇によって変形する変形部の肉厚よりも大きくなるように構成されている。   In the secondary battery disclosed in Patent Document 2, the diaphragm is configured such that the thickness of the portion welded to the member constituting the current path is larger than the thickness of the deformed portion deformed by the increase in internal pressure. ing.

また、特開２０１４−１３９９０４号公報には、内圧が上昇した際に確実に安定して電流遮断することを目的とした、角形二次電池が開示されている（特許文献３）。   Japanese Patent Application Laid-Open No. 2014-139904 discloses a prismatic secondary battery for the purpose of reliably and stably interrupting current when the internal pressure increases (Patent Document 3).

特許文献３に開示された角形二次電池は、電池蓋に開口する開口部に挿通される接続端子と、電池内に配置され、接続端子に接続されるリードと、リードに接続され、電池内の内部圧力の上昇により変形するダイヤフラムとを有する。ダイヤフラムは、シール部材を介してリードにかしめ固定されている。   The prismatic secondary battery disclosed in Patent Document 3 includes a connection terminal that is inserted through an opening that opens in the battery lid, a lead that is disposed in the battery, and that is connected to the connection terminal, and is connected to the lead. And a diaphragm that is deformed by an increase in internal pressure. The diaphragm is caulked and fixed to the lead via a seal member.

特開２０１５−６０７５１号公報JP2015-60751A 特開２０１６−９６０１４号公報Japanese Patent Laid-Open No. 2006-96014 特開２０１４−１３９９０４号公報JP 2014-139904 A

上述の特許文献に開示されるように、電池要素を収容する外装体の内圧が所定以上に上昇した場合に反転板が変形することにより、電池要素および外部端子間の電流の流れを遮断する電流遮断機構を備えた密閉型電池が知られている。   As disclosed in the above-mentioned patent document, when the internal pressure of the exterior body that houses the battery element rises above a predetermined level, the reversal plate is deformed to interrupt the current flow between the battery element and the external terminal. A sealed battery having a blocking mechanism is known.

このような密閉型電池において、外装体内で電池要素に接続される集電端子と、反転板とが、溶接により接合される。この際、集電端子および反転板の溶接工程に起因して、反転板が変形する時の外装体の内圧（反転圧）にばらつきが生じるおそれがある。また、密閉型電池の信頼性を高く維持するため、集電端子および反転板の溶接時に発生するスパッタ等の異物が、電池内部に侵入する可能性を低減する必要がある。   In such a sealed battery, the current collecting terminal connected to the battery element in the exterior body and the reversing plate are joined by welding. At this time, due to the welding process of the current collecting terminal and the reverse plate, there is a possibility that the internal pressure (reverse pressure) of the exterior body varies when the reverse plate is deformed. Further, in order to maintain high reliability of the sealed battery, it is necessary to reduce the possibility that foreign matters such as spatter generated during welding of the current collecting terminal and the reverse plate enter the battery.

そこでこの発明の目的は、上記の課題を解決することであり、電流遮断機構を備える密閉型電池において、反転板の反転圧にばらつきが生じることを抑制するとともに、電池内部に異物が侵入する可能性を低減する密閉型電池を提供することである。   Accordingly, an object of the present invention is to solve the above-described problem, and in a sealed battery equipped with a current interruption mechanism, it is possible to suppress the occurrence of variations in the reversing pressure of the reversing plate and to allow foreign objects to enter the battery. It is providing the sealed battery which reduces property.

この発明に従った密閉型電池は、電流遮断機構を備える密閉型電池である。密閉型電池は、電池要素を収容する外装体と、外装体内において電池要素に接続される集電端子と、外装体の外部に連通する中空部を形成する中空部材と、集電端子および中空部材の間に配置され、外装体の内圧が所定以上に上昇した時に変形することにより、電池要素と、外装体の外部に設けられた外部端子との間の電流の流れを遮断する反転板とを備える。集電端子は、中空部材に向けて突出する凸部と、凸部の周縁に沿って設けられる周縁部と、凸部を取り囲むように周縁部に設けられ、凸部の突出方向において集電端子の厚みを減じるように形成される切り欠き部とを含む。凸部は、凸部の突出方向において周縁部の厚みよりも大きい厚みを有する。反転板には、凸部が嵌合される嵌合部が設けられる。密閉型電池は、中空部材と対向する頂面を有し、凸部および嵌合部の間で、集電端子と反転板とを接合する溶接部を備える。反転板は、反転板が凸部に向かい合う側で凹形状をなし、反転板が中空部材に向かい合う側で凸形状をなす窪み部を含む。嵌合部は、窪み部がなす凹形状により構成される。
この発明の別の局面に従った密閉型電池は、電流遮断機構を備える密閉型電池である。密閉型電池は、電池要素を収容する外装体と、外装体内において電池要素に接続される集電端子と、外装体の外部に連通する中空部を形成する中空部材と、集電端子および中空部材の間に配置され、外装体の内圧が所定以上に上昇した時に変形することにより、電池要素と、外装体の外部に設けられた外部端子との間の電流の流れを遮断する反転板とを備える。集電端子は、中空部材に向けて突出する凸部と、凸部の周縁に沿って設けられる周縁部と、凸部を取り囲むように周縁部に設けられ、凸部の突出方向において集電端子の厚みを減じるように形成される切り欠き部とを含む。凸部は、凸部の突出方向において周縁部の厚みよりも大きい厚みを有する。反転板には、凸部が嵌合される嵌合部が設けられる。密閉型電池は、中空部材と対向する頂面を有し、凸部および嵌合部の間で、集電端子と反転板とを接合する溶接部を備える。 The sealed battery according to the present invention is a sealed battery provided with a current interruption mechanism. The sealed battery includes an exterior body that houses a battery element, a current collector terminal connected to the battery element in the exterior body, a hollow member that forms a hollow portion that communicates with the outside of the exterior body, a current collector terminal, and a hollow member And a reversing plate that interrupts the flow of current between the battery element and the external terminal provided outside the exterior body by being deformed when the internal pressure of the exterior body rises above a predetermined level. Prepare. The current collecting terminal is provided at the peripheral portion so as to surround the convex portion, the convex portion protruding toward the hollow member, the peripheral portion provided along the peripheral edge of the convex portion, and in the protruding direction of the convex portion. And a notch portion formed so as to reduce the thickness. The convex part has a thickness larger than the thickness of the peripheral part in the protruding direction of the convex part. The reversing plate is provided with a fitting portion into which the convex portion is fitted. The sealed battery has a top surface facing the hollow member, and includes a welded portion that joins the current collecting terminal and the reversing plate between the convex portion and the fitting portion. The reversing plate includes a recessed portion having a concave shape on the side where the reversing plate faces the convex portion and a convex shape on the side where the reversing plate faces the hollow member. A fitting part is comprised by the concave shape which a hollow part makes.
A sealed battery according to another aspect of the present invention is a sealed battery provided with a current interruption mechanism. The sealed battery includes an exterior body that houses a battery element, a current collector terminal connected to the battery element in the exterior body, a hollow member that forms a hollow portion that communicates with the outside of the exterior body, a current collector terminal, and a hollow member And a reversing plate that interrupts the flow of current between the battery element and the external terminal provided outside the exterior body by being deformed when the internal pressure of the exterior body rises above a predetermined level. Prepare. The current collecting terminal is provided at the peripheral portion so as to surround the convex portion, the convex portion protruding toward the hollow member, the peripheral portion provided along the peripheral edge of the convex portion, and in the protruding direction of the convex portion. And a notch portion formed so as to reduce the thickness. The convex part has a thickness larger than the thickness of the peripheral part in the protruding direction of the convex part. The reversing plate is provided with a fitting portion into which the convex portion is fitted. The sealed battery has a top surface facing the hollow member, and includes a welded portion that joins the current collecting terminal and the reversing plate between the convex portion and the fitting portion.

このように構成された密閉型電池によれば、突出部を嵌合部に嵌合した状態で集電端子と反転板とを溶接することにより、凸部および嵌合部間において集電端子と反転板との突き合わせ溶接が可能となり、また、溶接部において集電端子の厚み方向の溶接代を容易に確保することができる。また、集電端子に対する反転板の溶接位置がずれることを防止できる。これにより、集電端子および反転板の溶接工程に起因して反転板の反転圧にばらつきが生じることを抑制できる。また、溶接部は、中空部材と対向する頂面を有しており、集電端子および反転板を外装体の外側から溶接したものである。これにより、電池内部にスパッタ等の異物が侵入する可能性を低減することができる。   According to the sealed battery configured as described above, the current collector terminal and the reversing plate are welded in a state where the projecting portion is fitted to the fitting portion, so that the current collecting terminal is connected between the convex portion and the fitting portion. Butt welding with the reversing plate is possible, and the welding margin in the thickness direction of the current collecting terminal can be easily secured at the welded portion. Moreover, it can prevent that the welding position of the inversion board with respect to a current collection terminal shift | deviates. Thereby, it can suppress that dispersion | variation arises in the inversion pressure of an inversion board resulting from the welding process of a current collection terminal and an inversion board. In addition, the welded portion has a top surface facing the hollow member, and the current collector terminal and the reverse plate are welded from the outside of the exterior body. Thereby, possibility that foreign materials, such as a sputter | spatter, will penetrate | invade inside a battery can be reduced.

また好ましくは、嵌合部は、反転板を貫通する貫通孔である。
このように構成された密閉型電池によれば、集電端子に対する反転板の溶接位置がずれることを、より効果的に防ぐことができる。 Preferably, the fitting portion is a through hole that penetrates the reversing plate.
According to the sealed battery configured as described above, it is possible to more effectively prevent the welding position of the reversing plate with respect to the current collecting terminal from being shifted.

また好ましくは、反転板は、反転板が凸部に向かい合う側で凹形状をなし、反転板が中空部材に向かい合う側で凸形状をなす窪み部を含む。嵌合部は、窪み部がなす凹形状により構成される。   Preferably, the reversing plate includes a recessed portion having a concave shape on the side where the reversing plate faces the convex portion, and a convex shape on the side where the reversing plate faces the hollow member. A fitting part is comprised by the concave shape which a hollow part makes.

このように構成された密閉型電池によれば、溶接部において集電端子の厚み方向の溶接代をより容易に確保することができる。   According to the sealed battery configured in this manner, the welding allowance in the thickness direction of the current collecting terminal can be more easily ensured at the welded portion.

以上に説明したように、この発明に従えば、電流遮断機構を備える密閉型電池において、反転板の反転圧にばらつきが生じることを抑制するとともに、電池内部に異物が侵入する可能性を低減する密閉型電池を提供することができる。   As described above, according to the present invention, in a sealed battery having a current interrupting mechanism, it is possible to suppress the occurrence of variations in the reversing pressure of the reversing plate and to reduce the possibility of foreign matter entering the battery. A sealed battery can be provided.

この発明の実施の形態１における密閉型電池を示す斜視図である。It is a perspective view which shows the sealed battery in Embodiment 1 of this invention. 図１中のＩＩ−ＩＩ線上に沿った密閉型電池を示す断面図である。It is sectional drawing which shows the sealed battery along the II-II line in FIG. 図２中の２点鎖線ＩＩＩで囲まれる範囲を拡大して示す断面図である。It is sectional drawing which expands and shows the range enclosed with the dashed-two dotted line III in FIG. 図２中の集電端子を単体で示す平面図である。It is a top view which shows the current collection terminal in FIG. 2 alone. 図２中の反転板を単体で示す平面図である。It is a top view which shows the inversion board in FIG. 図１中の密閉型電池の製造方法において、集電端子および反転板の溶接工程を示す断面図である。FIG. 2 is a cross-sectional view illustrating a welding process of a current collecting terminal and a reversal plate in the method for manufacturing a sealed battery in FIG. 1. 比較例における密閉型電池の製造方法において、集電端子および反転板の溶接工程を示す断面図である。It is sectional drawing which shows the welding process of a current collection terminal and an inversion board in the manufacturing method of the sealed battery in a comparative example. 図６中の２点鎖線ＶＩＩＩで囲まれた範囲を拡大して示す断面図である。It is sectional drawing which expands and shows the range enclosed with the dashed-two dotted line VIII in FIG. 図６中の２点鎖線ＶＩＩＩで囲まれた範囲を拡大して示す断面図である。It is sectional drawing which expands and shows the range enclosed with the dashed-two dotted line VIII in FIG. この発明の実施の形態２における密閉型電池を示す断面図である。It is sectional drawing which shows the sealed battery in Embodiment 2 of this invention. 図１０中の密閉型電池の製造方法において、集電端子および反転板の溶接工程を示す断面図である。FIG. 11 is a cross-sectional view showing a welding process of a current collecting terminal and a reverse plate in the method for manufacturing a sealed battery in FIG. 10.

この発明の実施の形態について、図面を参照して説明する。なお、以下で参照する図面では、同一またはそれに相当する部材には、同じ番号が付されている。   Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

（実施の形態１）
図１は、この発明の実施の形態１における密閉型電池を示す斜視図である。図２は、図１中のＩＩ−ＩＩ線上に沿った密閉型電池を示す断面図である。 (Embodiment 1)
1 is a perspective view showing a sealed battery according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing the sealed battery along the line II-II in FIG.

図１および図２を参照して、本実施の形態における密閉型電池１０は、車両駆動用であり、たとえば、ガソリンエンジンやディーゼルエンジン等の内燃機関と、充放電可能なバッテリから電力供給されるモータとを動力源とするハイブリッド自動車や、外部充電が可能なプラグインハイブリッド自動車、電気自動車などに搭載される。   Referring to FIGS. 1 and 2, sealed battery 10 in the present embodiment is for vehicle driving, and is supplied with power from, for example, an internal combustion engine such as a gasoline engine or a diesel engine and a chargeable / dischargeable battery. It is mounted on a hybrid vehicle that uses a motor as a power source, a plug-in hybrid vehicle that can be externally charged, an electric vehicle, and the like.

密閉型電池１０は、電池要素１２と、外装体１４と、正極端子２１Ｐおよび負極端子２１Ｎと、集電端子５１とを有する。   The sealed battery 10 includes a battery element 12, an exterior body 14, a positive terminal 21 </ b> P and a negative terminal 21 </ b> N, and a current collecting terminal 51.

電池要素１２は、正負の電極がセパレータを介して積層されて構成されている。外装体１４は、ケース１５および封口体１６が組み合わさって構成されている。ケース１５および封口体１６は、アルミニウム等の金属から形成されている。ケース１５は、一方向に開口された略直方体のケース形状を有し、その内部には、電解液とともに電池要素１２が収容されている。封口体１６は、矩形の平面視を有する平板形状を有し、ケース１５の開口を塞ぐように設けられている。封口体１６は、ケース１５に溶接されている。封口体１６には、貫通孔１７が設けられている。   The battery element 12 is configured by stacking positive and negative electrodes via a separator. The exterior body 14 is configured by combining a case 15 and a sealing body 16. The case 15 and the sealing body 16 are made of a metal such as aluminum. The case 15 has a substantially rectangular parallelepiped case shape opened in one direction, and the battery element 12 is accommodated together with the electrolytic solution therein. The sealing body 16 has a flat plate shape having a rectangular plan view, and is provided so as to close the opening of the case 15. The sealing body 16 is welded to the case 15. A through hole 17 is provided in the sealing body 16.

正極端子２１Ｐおよび負極端子２１Ｎは、密閉型電池１０の外部端子２１として、外装体１４の外部に設けられている。   The positive electrode terminal 21 </ b> P and the negative electrode terminal 21 </ b> N are provided outside the exterior body 14 as the external terminals 21 of the sealed battery 10.

集電端子５１は、外装体１４の内部に設けられている。集電端子５１は、外装体１４内において電池要素１２に接続されている。   The current collecting terminal 51 is provided inside the exterior body 14. The current collecting terminal 51 is connected to the battery element 12 in the exterior body 14.

密閉型電池１０は、外装体１４の内圧が所定以上に上昇した場合に、電池要素１２と外部端子２１との間の電流の流れを遮断する電流遮断機構を備える。電流遮断機構は、正極端子２１Ｐおよび負極端子２１Ｎの少なくともいずれか一方に設けられている。以下、電流遮断機構の構造について詳細に説明する。   The sealed battery 10 includes a current interrupt mechanism that interrupts the flow of current between the battery element 12 and the external terminal 21 when the internal pressure of the exterior body 14 rises to a predetermined level or more. The current interruption mechanism is provided in at least one of the positive terminal 21P and the negative terminal 21N. Hereinafter, the structure of the current interruption mechanism will be described in detail.

密閉型電池１０は、インシュレータ２３と、ガスケット２５と、中空リベット３１と、反転板４１と、複数の樹脂ホルダー５７とをさらに有する。   The sealed battery 10 further includes an insulator 23, a gasket 25, a hollow rivet 31, a reversing plate 41, and a plurality of resin holders 57.

インシュレータ２３は、外装体１４の外部に設けられている。インシュレータ２３は、外装体１４の外部から封口体１６に重ね合わされている。インシュレータ２３は、封口体１６と外部端子２１との間に介挿されている。インシュレータ２３は、絶縁性材料から形成されており、封口体１６および外部端子２１の間を電気的に絶縁している。   The insulator 23 is provided outside the exterior body 14. The insulator 23 is superimposed on the sealing body 16 from the outside of the exterior body 14. The insulator 23 is inserted between the sealing body 16 and the external terminal 21. The insulator 23 is made of an insulating material and electrically insulates between the sealing body 16 and the external terminal 21.

中空リベット３１は、導電性材料から形成されている。中空リベット３１は、中空部３６を形成する中空部材として設けられている。中空部３６は、仮想上の中心軸１０１に沿って延び、外装体１４の外部（外部空間）に連通している。中空リベット３１は、封口体１６に設けられた貫通孔１７に挿通されている。中空リベット３１は、外装体１４の外部で外部端子２１に接続され、外装体１４の内部で反転板４１に接続されている。中空リベット３１は、外部端子２１および反転板４１の間を電気的に接続している。   The hollow rivet 31 is made of a conductive material. The hollow rivet 31 is provided as a hollow member that forms the hollow portion 36. The hollow portion 36 extends along the virtual central axis 101 and communicates with the exterior (external space) of the exterior body 14. The hollow rivet 31 is inserted through the through hole 17 provided in the sealing body 16. The hollow rivet 31 is connected to the external terminal 21 outside the exterior body 14 and is connected to the reversing plate 41 inside the exterior body 14. The hollow rivet 31 electrically connects the external terminal 21 and the reversing plate 41.

より具体的には、中空リベット３１は、その構成部位として、筒部３３、第１鍔部３２、第２鍔部３４および外周縁部３５を有する。   More specifically, the hollow rivet 31 includes a cylindrical portion 33, a first flange portion 32, a second flange portion 34, and an outer peripheral edge portion 35 as constituent parts thereof.

筒部３３は、中心軸１０１を中心に筒状に延びる形状を有する。筒部３３は、円筒形状を有する。中空リベット３１のうちの筒部３３が、貫通孔１７に挿通されている。筒部３３は、外装体１４の外部において、インシュレータ２３および外部端子２１を貫通するように設けられている。   The cylindrical portion 33 has a shape extending in a cylindrical shape around the central axis 101. The cylinder part 33 has a cylindrical shape. A cylindrical portion 33 of the hollow rivet 31 is inserted through the through hole 17. The cylindrical portion 33 is provided outside the exterior body 14 so as to penetrate the insulator 23 and the external terminal 21.

第１鍔部３２は、外装体１４の外部に向けて筒状に延びる筒部３３の端部に設けられている。第１鍔部３２は、中心軸１０１を中心にしてその半径方向外側に広がる鍔形状を有する。第１鍔部３２は、外部端子２１と接触している。インシュレータ２３および外部端子２１は、第１鍔部３２と封口体１６との間に挟持されている。   The first flange 32 is provided at the end of a cylindrical portion 33 that extends in a cylindrical shape toward the outside of the exterior body 14. The first flange portion 32 has a flange shape that spreads outward in the radial direction about the central axis 101. The first flange 32 is in contact with the external terminal 21. The insulator 23 and the external terminal 21 are sandwiched between the first flange 32 and the sealing body 16.

第２鍔部３４は、外装体１４の内部に向けて筒状に延びる筒部３３の端部（第１鍔部３２が設けられた端部とは反対側の筒部３３の端部）に設けられている。第２鍔部３４は、中心軸１０１を中心にしてその半径方向外側に広がる鍔形状を有する。外周縁部３５は、第２鍔部３４の外周縁に設けられている。外周縁部３５は、第２鍔部３４の外周縁から、中心軸１０１の軸方向において集電端子５１に近づく方向に折れ曲がって設けられている。後述する反転板４１の外周縁部４２は、外周縁部３５の内側に嵌合されている。   The second flange 34 is formed at the end of the cylinder 33 that extends in a cylindrical shape toward the inside of the exterior body 14 (the end of the cylinder 33 opposite to the end provided with the first flange 32). Is provided. The second flange 34 has a flange shape that spreads outward in the radial direction about the central axis 101. The outer peripheral edge portion 35 is provided on the outer peripheral edge of the second flange portion 34. The outer peripheral edge portion 35 is bent from the outer peripheral edge of the second flange portion 34 in a direction approaching the current collecting terminal 51 in the axial direction of the central shaft 101. An outer peripheral edge 42 of the reversing plate 41 described later is fitted inside the outer peripheral edge 35.

ガスケット２５は、封口体１６と中空リベット３１との間に介挿されている。ガスケット２５は、封口体１６と中空リベット３１との間のシール材として設けられている。   The gasket 25 is interposed between the sealing body 16 and the hollow rivet 31. The gasket 25 is provided as a sealing material between the sealing body 16 and the hollow rivet 31.

図３は、図２中の２点鎖線ＩＩＩで囲まれる範囲を拡大して示す断面図である。図４は、図２中の集電端子を単体で示す平面図である。図５は、図２中の反転板を単体で示す平面図である。   3 is an enlarged cross-sectional view of a range surrounded by a two-dot chain line III in FIG. FIG. 4 is a plan view showing the current collecting terminal in FIG. 2 alone. FIG. 5 is a plan view showing the reversing plate in FIG. 2 alone.

図１から図５を参照して、反転板４１は、導電性材料から形成されている。反転板４１は、中心軸１０１の軸方向において、中空リベット３１（第２鍔部３４）および集電端子５１の間に配置されている。反転板４１は、中空リベット３１および集電端子５１に接続されている。反転板４１は、中空リベット３１および集電端子５１の間を電気的に接続している。   Referring to FIGS. 1 to 5, the reversing plate 41 is made of a conductive material. The inversion plate 41 is disposed between the hollow rivet 31 (second flange 34) and the current collecting terminal 51 in the axial direction of the central shaft 101. The reversing plate 41 is connected to the hollow rivet 31 and the current collecting terminal 51. The reversing plate 41 electrically connects the hollow rivet 31 and the current collecting terminal 51.

反転板４１は、円形の平面視を有する薄板から形成されている。反転板４１は、その平面視における円形の中心が中心軸１０１に重なるように設けられている。反転板４１は、全体として、中心軸１０１の軸方向において中空リベット３１に対向する側で凹となり、中心軸１０１の軸方向において集電端子５１に対向する側で凸となる反った形状を有する。   The inversion plate 41 is formed from a thin plate having a circular plan view. The reversing plate 41 is provided such that the center of the circle in plan view overlaps the central axis 101. The inversion plate 41 as a whole has a warped shape that is concave on the side facing the hollow rivet 31 in the axial direction of the central axis 101 and convex on the side facing the current collecting terminal 51 in the axial direction of the central axis 101. .

反転板４１は、その構成部位として、傾斜部４３および外周縁部４２を有する。傾斜部４３は、中心軸１０１の軸方向において集電端子５１から中空リベット３１に近づく方向に傾斜しながら、中心軸１０１の半径方向内側から半径方向外側に広がる形状を有する。外周縁部４２は、傾斜部４３の外周縁に設けられている。外周縁部４２は、中心軸１０１の軸方向において一定を厚みを有しながら、中心軸１０１を中心に周回するリング形状を有する。   The inversion plate 41 has an inclined portion 43 and an outer peripheral edge portion 42 as its constituent parts. The inclined portion 43 has a shape extending from the radially inner side to the radially outer side of the central shaft 101 while being inclined in a direction approaching the hollow rivet 31 from the current collecting terminal 51 in the axial direction of the central shaft 101. The outer peripheral edge portion 42 is provided on the outer peripheral edge of the inclined portion 43. The outer peripheral edge portion 42 has a ring shape that goes around the central axis 101 while having a constant thickness in the axial direction of the central axis 101.

反転板４１には、嵌合部４４が設けられている。嵌合部４４は、傾斜部４３の内周縁に設けられている。本実施の形態では、嵌合部４４が、中心軸１０１の軸方向において反転板４１を貫通する貫通孔として設けられている。嵌合部４４は、中心軸１０１を中心とする円形の開口形状を有する。嵌合部４４は、中心軸１０１の軸方向において中空リベット３１（中空部３６）と対向して設けられている。   The reversing plate 41 is provided with a fitting portion 44. The fitting portion 44 is provided on the inner peripheral edge of the inclined portion 43. In the present embodiment, the fitting portion 44 is provided as a through hole that penetrates the reversing plate 41 in the axial direction of the central shaft 101. The fitting portion 44 has a circular opening shape centered on the central axis 101. The fitting portion 44 is provided to face the hollow rivet 31 (hollow portion 36) in the axial direction of the central shaft 101.

集電端子５１は、その構成部位として、板状部５６を有する。板状部５６は、板形状を有する。板状部５６は、中心軸１０１の軸方向において中空リベット３１（第２鍔部３４および外周縁部３５）と対向して配置されている。   The current collecting terminal 51 has a plate-like portion 56 as a constituent part thereof. The plate-like portion 56 has a plate shape. The plate-like portion 56 is disposed to face the hollow rivet 31 (the second flange portion 34 and the outer peripheral edge portion 35) in the axial direction of the central shaft 101.

板状部５６には、複数の貫通孔５５が形成されている。複数の貫通孔５５には、それぞれ、複数の樹脂ホルダー５７が装着されている。樹脂ホルダー５７は、その構成部位として、基台部５７ｊを有する。基台部５７ｊは、板状部５６から中空リベット３１に向けて突出して設けられている。反転板４１の外周縁部４２および中空リベット３１の外周縁部３５は、基台部５７ｊに載置されている。   A plurality of through holes 55 are formed in the plate-like portion 56. A plurality of resin holders 57 are respectively attached to the plurality of through holes 55. The resin holder 57 has a base part 57j as a constituent part thereof. The base portion 57j is provided so as to protrude from the plate-like portion 56 toward the hollow rivet 31. The outer peripheral edge portion 42 of the reversing plate 41 and the outer peripheral edge portion 35 of the hollow rivet 31 are placed on the base portion 57j.

集電端子５１（板状部５６）は、その構成部位として、凸部５２と、周縁部５３と、切り欠き部５４とを有する。   The current collection terminal 51 (plate-like part 56) has the convex part 52, the peripheral part 53, and the notch part 54 as the structure part.

凸部５２は、中空リベット３１（中空部３６）に向けて突出して設けられている。凸部５２は、周縁部５３を基準にして中心軸１０１の軸方向に突出する凸形状を有する。凸部５２は、中心軸１０１の軸方向から見た場合に、円形の平面視を有する。凸部５２は、反転板４１の嵌合部４４に嵌合されている。   The convex portion 52 is provided so as to protrude toward the hollow rivet 31 (hollow portion 36). The convex portion 52 has a convex shape that projects in the axial direction of the central axis 101 with respect to the peripheral edge portion 53. The convex portion 52 has a circular plan view when viewed from the axial direction of the central axis 101. The convex portion 52 is fitted into the fitting portion 44 of the reversing plate 41.

周縁部５３は、凸部５２の周縁に沿って設けられている。周縁部５３は、中心軸１０１の軸方向から見た場合に、凸部５２の周りを周回する領域に設けられている。凸部５２の突出方向、すなわち、中心軸１０１の軸方向における集電端子５１の長さを厚みという場合に、凸部５２は、周縁部５３よりも大きい厚みを有する。   The peripheral portion 53 is provided along the peripheral edge of the convex portion 52. The peripheral portion 53 is provided in a region that circulates around the convex portion 52 when viewed from the axial direction of the central shaft 101. When the length of the current collecting terminal 51 in the protruding direction of the convex portion 52, that is, the axial direction of the central axis 101 is referred to as the thickness, the convex portion 52 has a thickness larger than the peripheral portion 53.

周縁部５３は、その構成部位として、肉厚部５３ｐと、肉薄部５３ｑとを有する。肉厚部５３ｐは、凸部５２の周縁に沿って設けられている。肉薄部５３ｑは、肉厚部５３ｐの周縁に沿って設けられている。周縁部５３は、肉薄部５３ｑの厚みが肉厚部５３ｐの厚みよりもさらに小さくなる段差構造を有する。   The peripheral part 53 has the thick part 53p and the thin part 53q as the structure part. The thick part 53p is provided along the periphery of the convex part 52. The thin part 53q is provided along the periphery of the thick part 53p. The peripheral portion 53 has a step structure in which the thickness of the thin portion 53q is further smaller than the thickness of the thick portion 53p.

切り欠き部５４は、凸部５２を取り囲むように設けられている。切り欠き部５４は、中心軸１０１の軸方向から見て凸部５２の外周上に設けられている。切り欠き部５４は、周縁部５３に設けられている。切り欠き部５４は、周縁５３において集電端子５１の厚みを減じるように設けられている。切り欠き部５４は、中心軸１０１の軸方向において集電端子５１が反転板４１と対向する側とは反対側に設けられている。切り欠き部５４は、周縁部５３のうちの肉厚部５３ｐと肉薄部５３ｑとの境界に設けられている。   The cutout portion 54 is provided so as to surround the convex portion 52. The cutout portion 54 is provided on the outer periphery of the convex portion 52 when viewed from the axial direction of the central shaft 101. The notch 54 is provided in the peripheral edge 53. The notch 54 is provided at the peripheral edge 53 so as to reduce the thickness of the current collecting terminal 51. The notch 54 is provided on the side opposite to the side where the current collecting terminal 51 faces the reversing plate 41 in the axial direction of the central shaft 101. The notch 54 is provided at the boundary between the thick part 53p and the thin part 53q in the peripheral part 53.

密閉型電池１０は、溶接部６１をさらに有する。溶接部６１は、凸部５２および嵌合部４４の間で、集電端子５１と反転板４１とを接合している。溶接部６１は、集電端子５１と反転板４１とを溶接することによって設けられている。より具体的には、溶接部６１は、レーザ溶接により集電端子５１および反転板４１が溶融し、そのあと凝固することによって、互いに一体化されている部分である。   The sealed battery 10 further has a welded portion 61. The welding part 61 joins the current collecting terminal 51 and the reversing plate 41 between the convex part 52 and the fitting part 44. The welded portion 61 is provided by welding the current collecting terminal 51 and the reversing plate 41. More specifically, the welding part 61 is a part integrated with each other by melting the current collecting terminal 51 and the reversing plate 41 by laser welding and then solidifying.

溶接部６１は、凸部５２と嵌合部４４とが中心軸１０１の半径方向において突き合された部分に設けられている。溶接部６１は、頂面６２を有する。頂面６２は、中心軸１０１の軸方向において中空リベット３１（中空部３６）と対向している。溶接部６１は、中心軸１０１の軸方向において、頂面６２から、集電端子５１および反転板４１の所定深さに渡って設けられている。   The welded portion 61 is provided at a portion where the convex portion 52 and the fitting portion 44 are abutted in the radial direction of the central axis 101. The weld 61 has a top surface 62. The top surface 62 faces the hollow rivet 31 (hollow part 36) in the axial direction of the central shaft 101. The welded portion 61 is provided from the top surface 62 to a predetermined depth of the current collecting terminal 51 and the reversing plate 41 in the axial direction of the central shaft 101.

このように、反転板４１が、中心軸１０１の半径方向外側で中空リベット３１に接続され、中心軸１０１の半径方向内側で集電端子５１に接続されることによって、外装体１４の内部に、電池要素１２および電解液を収容する密閉空間が形成されている。外装体１４の内圧が上昇すると、反転板４１が、図２中の矢印１０２に示すように中空リベット３１に近づく方向に変形する。このとき、集電端子５１が切り欠き部５４を起点に破断することにより、電池要素１２と外部端子２１との間の電流の流れが遮断される。   In this way, the reversing plate 41 is connected to the hollow rivet 31 on the radially outer side of the central shaft 101 and connected to the current collecting terminal 51 on the radially inner side of the central shaft 101, so that A sealed space for accommodating the battery element 12 and the electrolytic solution is formed. When the internal pressure of the exterior body 14 increases, the reversing plate 41 is deformed in a direction approaching the hollow rivet 31 as indicated by an arrow 102 in FIG. At this time, the current collecting terminal 51 breaks with the notch 54 as a starting point, whereby the current flow between the battery element 12 and the external terminal 21 is interrupted.

図６は、図１中の密閉型電池の製造方法において、集電端子および反転板の溶接工程を示す断面図である。   FIG. 6 is a cross-sectional view showing the welding process of the current collector terminal and the reverse plate in the method for manufacturing the sealed battery in FIG.

図６を参照して、密閉型電池１０の製造方法においては、まず、封口体１６に、インシュレータ２３、外部端子２１、ガスケット２５、中空リベット３１および反転板４１を組み付ける。この際、外装体１４の外側に突出する中空リベット３１の先端部をかしめ加工することによって、封口体１６に、インシュレータ２３、外部端子２１およびガスケット２５を固定する。   Referring to FIG. 6, in the manufacturing method of sealed battery 10, first, insulator 23, external terminal 21, gasket 25, hollow rivet 31 and reversing plate 41 are assembled to sealing body 16. At this time, the insulator 23, the external terminal 21, and the gasket 25 are fixed to the sealing body 16 by caulking the tip of the hollow rivet 31 that protrudes outside the exterior body 14.

溶接により集電端子５１を電池要素１２に接合する。次に、反転板４１の嵌合部４４に、集電端子５１の凸部５２を嵌合する。中空部３６を通じて嵌合部４４および凸部５２の突き合わせ部分にレーザ光１１０を照射することによって（突き合わせ溶接）、反転板４１および集電端子５１を接合する。   The current collecting terminal 51 is joined to the battery element 12 by welding. Next, the convex portion 52 of the current collecting terminal 51 is fitted into the fitting portion 44 of the reversing plate 41. The reversing plate 41 and the current collecting terminal 51 are joined by irradiating the butted portion of the fitting portion 44 and the convex portion 52 through the hollow portion 36 with the laser beam 110 (butt welding).

次に、上記溶接工程により得られたアセンブリをケース１５内に配置し、溶接によりケース１５に封口体１６を溶接する。封口体１６に設けられた注液口を通じてケース１５内に電解液を注入し、そのあと、注液孔を塞ぐ。以上の工程により、図１中の密閉型電池１０が完成する。   Next, the assembly obtained by the welding process is placed in the case 15 and the sealing body 16 is welded to the case 15 by welding. An electrolytic solution is injected into the case 15 through a liquid injection port provided in the sealing body 16, and then the liquid injection hole is closed. The sealed battery 10 in FIG. 1 is completed through the above steps.

続いて、図１中の密閉型電池１０により奏される作用効果について、比較例における密閉型電池の課題を交えながら説明する。   Then, the effect produced by the sealed battery 10 in FIG. 1 will be described with the subject of the sealed battery in the comparative example.

図７は、比較例における密閉型電池の製造方法において、集電端子および反転板の溶接工程を示す断面図である。図７を参照して、本比較例における密閉型電池は、密閉型電池１０における反転板４１および集電端子５１に替えて、反転板１４１および集電端子１５１を有する。   FIG. 7 is a cross-sectional view illustrating a welding process of a current collecting terminal and a reversal plate in a method for manufacturing a sealed battery in a comparative example. Referring to FIG. 7, the sealed battery in this comparative example has a reversing plate 141 and a current collecting terminal 151 instead of the reversing plate 41 and the current collecting terminal 51 in the sealed battery 10.

反転板１４１には、反転板４１における嵌合部４４が設けられていない。すなわち、反転板４１は、中心軸１０１が交わる中央部が閉塞された形状を有する。集電端子１５１には、貫通孔８１が設けられている。貫通孔８１は、中心軸１０１を中心とする円形の開口形状を有する。このような構成を備える比較例における密閉型電池の製造方法においては、反転板１４１と、貫通孔８１を規定する集電端子１５１の内壁との隅部にレーザ光を照射することにより（隅肉溶接）、反転板１４１および集電端子１５１を溶接する。   The reversing plate 141 is not provided with the fitting portion 44 in the reversing plate 41. That is, the reversing plate 41 has a shape in which the central portion where the central axes 101 intersect is closed. The current collecting terminal 151 is provided with a through hole 81. The through hole 81 has a circular opening shape centered on the central axis 101. In the manufacturing method of the sealed battery in the comparative example having such a configuration, laser light is applied to the corners of the reversing plate 141 and the inner wall of the current collecting terminal 151 that defines the through hole 81 (fillet). Welding), the reverse plate 141 and the current collecting terminal 151 are welded.

反転板１４１は、一般的に、極めて小さい厚み（たとえば、０．３ｍｍ）を有する。このような薄肉の（熱容量が小さい）反転板１４１に対して、集電端子１５１を隅肉溶接すると、レーザ光が反転板１４１を貫通したり、反転板１４１への溶接熱の熱影響が大きくなったりして、反転板１４１の反転圧にばらつきが生じるおそれがある。   The reversing plate 141 generally has a very small thickness (for example, 0.3 mm). When the current collecting terminal 151 is welded to the thin reverse plate 141 (having a small heat capacity), the laser beam penetrates the reverse plate 141 or the heat effect of the welding heat on the reverse plate 141 is large. The reversal pressure of the reversing plate 141 may vary.

また、反転板１４１および集電端子１５１を、図２中の樹脂ホルダー５７を介して相互に位置決めする構成では、上記溶接工程時に、反転板１４１および集電端子１５１の間の位置ずれ（貫通孔８１と反転板１４１との間の芯ずれ）が発生し、反転板１４１の反転圧にばらつきが生じるおそれがある。   Further, in the configuration in which the reversing plate 141 and the current collecting terminal 151 are positioned with respect to each other via the resin holder 57 in FIG. 2, the displacement between the reversing plate 141 and the current collecting terminal 151 (through-hole) during the welding process. 81 and the reversing plate 141), the reversing pressure of the reversing plate 141 may vary.

さらに、上記溶接工程時に外装体１４の内部側からレーザ光を照射するため、電池内部に収容される部品にスパッタ等の異物が付着するおそれがある。   Further, since laser light is irradiated from the inside of the outer package 14 during the welding process, there is a risk that foreign matters such as spatter will adhere to the components housed inside the battery.

以上のような理由により、比較例における密閉型電池では、反転板１４１および集電端子１５１間の接合部において安定したロバスト性を得ることや、電池内部への異物侵入の可能性を十分に低減することが難しい。   For the reasons described above, in the sealed battery in the comparative example, stable robustness is obtained at the joint between the reversing plate 141 and the current collecting terminal 151, and the possibility of foreign matter entering the battery is sufficiently reduced. Difficult to do.

図８および図９は、図６中の２点鎖線ＶＩＩＩで囲まれた範囲を拡大して示す断面図である。図８中には、反転板４１および集電端子５１の溶接時に、最小限の反転板４１および集電端子５１の溶け込み量が得られた場合が示され、図９中には、反転板４１および集電端子５１の溶け込み量が大きくなった場合が示されている。   8 and 9 are cross-sectional views showing an enlarged view of a range surrounded by a two-dot chain line VIII in FIG. FIG. 8 shows a case where the minimum amount of penetration of the reversing plate 41 and the current collecting terminal 51 is obtained when the reversing plate 41 and the current collecting terminal 51 are welded. And the case where the amount of melt | dissolution of the current collection terminal 51 becomes large is shown.

図６、図８および図９を参照して、本実施の形態における密閉型電池１０においては、凸部５２および嵌合部４４間における突き合わせ溶接が可能となり、また、溶接部６１における厚み方向の溶接代を容易に確保することができるため、レーザ光の貫通や反転板４１が溶接熱の影響を過大に受けることを防止できる。また、凸部５２が嵌合部４４に嵌合されることによって、反転板４１および集電端子５１が相互に高精度に位置決めされる。したがって、集電端子５１および反転板４１の溶接工程に起因して反転板４１の反転圧にばらつきが生じることを抑制できる。   With reference to FIGS. 6, 8, and 9, in sealed battery 10 in the present embodiment, butt welding can be performed between convex portion 52 and fitting portion 44, and thickness direction of welded portion 61 can be increased. Since the welding allowance can be easily secured, it is possible to prevent the penetration of the laser beam and the reversal plate 41 from being excessively affected by the welding heat. Further, by fitting the convex portion 52 to the fitting portion 44, the reversing plate 41 and the current collecting terminal 51 are positioned with high accuracy. Therefore, it is possible to suppress variation in the reversing pressure of the reversing plate 41 due to the welding process of the current collecting terminal 51 and the reversing plate 41.

また、本実施の形態における密閉型電池１０においては、外装体１４の外部側からレーザ光１１０を照射することによって、反転板４１および集電端子５１を溶接する。これにより、溶接工程時に発生するスパッタ１２０等の異物が電池内部に侵入する可能性を十分に低減することができる。   Moreover, in the sealed battery 10 in the present embodiment, the reversing plate 41 and the current collecting terminal 51 are welded by irradiating the laser beam 110 from the outside of the exterior body 14. Thereby, it is possible to sufficiently reduce the possibility that foreign matters such as spatter 120 generated during the welding process enter the battery.

図８および図９中に示す密閉型電池１０の構成部品の寸法の一例は、以下のとおりである。
凸部５２の厚みＡ＝１．０ｍｍ
周縁部５３（肉厚部５３ｐ）の厚みＢ＝０．５ｍｍ
凸部５２の直径φＣ＝２．０ｍｍ
嵌合部４４の直径φＤ＝２．２ｍｍ
凸部５２および嵌合部４４の隙間の大きさＥ＝０．１ｍｍ
集電端子５１における溶融部６６の中心位置φＦ＝１．８ｍｍ
反転板４１における溶融部６６の中心位置φＧ＝２．４ｍｍ
反転板４１における溶融部６６の幅Ｈ＝０．４ｍｍ
集電端子５１における溶融部６６の幅Ｉ＝０．４ｍｍ
集電端子５１における溶融部６６の深さＪ（図８）＝０．３ｍｍ
反転板４１における溶融部６６の深さＫ（図８）＝０．１ｍｍ
反転板４１の厚みＬ＝０．３ｍｍ
中空部３６（溶接時の開口部）の直径＝５ｍｍ
集電端子５１における溶融部６６の深さＭ（図９）＝０．６ｍｍ
反転板４１における溶融部６６の深さＮ（図９）＝０．４ｍｍ
上記の寸法条件のもと、図８における反転板４１および集電端子５１の溶け込み量が０．９ｍｍ３となり、図９における反転板４１および集電端子５１の溶け込み量が２．５８ｍｍ３となる。この場合、溶接部６１における厚み方向の溶接代を約２．５倍以上に確保することが可能となる。 An example of the dimensions of the components of the sealed battery 10 shown in FIGS. 8 and 9 is as follows.
Thickness A of the convex portion 52 = 1.0 mm
Perimeter 53 (thick part 53p) thickness B = 0.5 mm
Diameter of convex part 52 φC = 2.0 mm
Diameter of fitting part 44 φD = 2.2 mm
The size of the gap between the convex portion 52 and the fitting portion 44 E = 0.1 mm
The center position φF of the melting portion 66 at the current collecting terminal 51 = 1.8 mm
The center position φG = 2.4 mm of the melting part 66 in the reversing plate 41
The width H of the melting part 66 in the reversing plate 41 is 0.4 mm.
The width I of the melting part 66 at the current collecting terminal 51 = 0.4 mm
Depth J (FIG. 8) of melted portion 66 at current collecting terminal 51 = 0.3 mm
Depth K of the melting part 66 in the reversing plate 41 (FIG. 8) = 0.1 mm
Reversal plate 41 thickness L = 0.3 mm
Diameter of hollow part 36 (opening during welding) = 5 mm
Depth M of the melting part 66 in the current collecting terminal 51 (FIG. 9) = 0.6 mm
Depth N (FIG. 9) of melting part 66 in reversing plate 41 = 0.4 mm
Under the above dimensions conditions, penetration amount 0.9 mm 3 next reverse plate 41 and the current collector terminal 51 in FIG. 8, the penetration amount of reverse plate 41 and the current collector terminal 51 in FIG. 9 becomes 2.58 mm 3 . In this case, the welding allowance in the thickness direction of the welded portion 61 can be secured about 2.5 times or more.

以上に説明した、この発明の実施の形態１における密閉型電池１０の構造についてまとめて説明すると、本実施の形態における密閉型電池１０は、電流遮断機構を備える密閉型電池である。密閉型電池１０は、電池要素１２を収容する外装体１４と、外装体１４内において電池要素１２に接続される集電端子５１と、外装体１４の外部に連通する中空部３６を形成する中空部材としての中空リベット３１と、集電端子５１および中空リベット３１の間に配置され、外装体１４の内圧が所定以上に上昇した時に変形することにより、電池要素１２と、外装体１４の外部に設けられた外部端子２１との間の電流の流れを遮断する反転板４１とを備える。集電端子５１は、中空リベット３１に向けて突出する凸部５２と、凸部５２の周縁に沿って設けられる周縁部５３と、凸部５２を取り囲むように周縁部５３に設けられ、凸部５２の突出方向において集電端子５１の厚みを減じるように形成される切り欠き部５４とを含む。凸部５２は、凸部５２の突出方向において周縁部５３の厚みよりも大きい厚みを有する。反転板４１には、凸部５２が嵌合される嵌合部４４が設けられる。密閉型電池１０は、中空リベット３１と対向する頂面６２を有し、凸部５２および嵌合部４４の間で、集電端子５１と反転板４１とを接合する溶接部６１を備える。   The structure of the sealed battery 10 according to the first embodiment of the present invention described above will be described together. The sealed battery 10 according to the present embodiment is a sealed battery provided with a current interruption mechanism. The sealed battery 10 has a hollow that forms an exterior body 14 that houses the battery element 12, a current collecting terminal 51 that is connected to the battery element 12 in the exterior body 14, and a hollow portion 36 that communicates with the outside of the exterior body 14. It is arranged between the hollow rivet 31 as a member, the current collecting terminal 51 and the hollow rivet 31, and is deformed when the internal pressure of the exterior body 14 rises to a predetermined level or more, so that the battery element 12 and the exterior body 14 are placed outside. And a reversing plate 41 that blocks the flow of current between the external terminal 21 provided. The current collecting terminal 51 is provided on the peripheral portion 53 so as to surround the convex portion 52, the convex portion 52 protruding toward the hollow rivet 31, the peripheral portion 53 provided along the peripheral edge of the convex portion 52, and the convex portion And a cutout portion 54 formed so as to reduce the thickness of the current collecting terminal 51 in the protruding direction of 52. The convex portion 52 has a thickness larger than the thickness of the peripheral edge portion 53 in the protruding direction of the convex portion 52. The reversing plate 41 is provided with a fitting portion 44 to which the convex portion 52 is fitted. The sealed battery 10 has a top surface 62 that faces the hollow rivet 31, and includes a welded portion 61 that joins the current collecting terminal 51 and the reversing plate 41 between the convex portion 52 and the fitting portion 44.

このように構成された、この発明の実施の形態１における密閉型電池１０によれば、反転板４１の反転圧にばらつきが生じることを抑制するとともに、電池内部に異物が侵入する可能性を低減することができる。   According to the sealed battery 10 according to the first embodiment of the present invention configured as described above, it is possible to suppress the occurrence of variation in the reversing pressure of the reversing plate 41 and to reduce the possibility of foreign matter entering the battery. can do.

（実施の形態２）
図１０は、この発明の実施の形態２における密閉型電池を示す断面図である。図１０は、実施の形態１における図３に対応する図である。本実施の形態における密閉型電池は、実施の形態１における密閉型電池１０と比較して、基本的には同様の構造を備える。以下、重複する構造については、その説明を繰り返さない。 (Embodiment 2)
FIG. 10 is a cross-sectional view showing a sealed battery according to Embodiment 2 of the present invention. FIG. 10 is a diagram corresponding to FIG. 3 in the first embodiment. The sealed battery in the present embodiment basically has the same structure as that of the sealed battery 10 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

図１０を参照して、本実施の形態では、反転板４１が、窪み部４５をさらに有する。窪み部４５は、傾斜部４３の半径方向内側に設けられている。窪み部４５は、反転板４１が凸部５２に向かい合う側で凹形状をなし、反転板４１が中空リベット３１に向かい合う側で凸形状をなす。窪み部４５は、有底の円筒形状を有する。嵌合部４４は、窪み部４５がなす凹形状により構成されている。   Referring to FIG. 10, in this embodiment, reversal plate 41 further has a recess 45. The recess 45 is provided inside the inclined portion 43 in the radial direction. The recess 45 has a concave shape on the side where the reverse plate 41 faces the convex portion 52, and has a convex shape on the side where the reverse plate 41 faces the hollow rivet 31. The hollow 45 has a bottomed cylindrical shape. The fitting part 44 is configured by a concave shape formed by the hollow part 45.

溶接部６１は、窪み部４５に頂面６２を有する。溶接部６１は、中心軸１０１の軸方向において、窪み部４５の底部分から凸部５２に達する深さまで設けられている。   The welded portion 61 has a top surface 62 in the recessed portion 45. The welding part 61 is provided from the bottom part of the hollow part 45 to the depth reaching the convex part 52 in the axial direction of the central axis 101.

図１１は、図１０中の密閉型電池の製造方法において、集電端子および反転板の溶接工程を示す断面図である。図１１を参照して、本実施の形態においても、中空部３６を通じて窪み部４５の底部分にレーザ光１１０を照射することによって、反転板４１および集電端子５１を接合する。   FIG. 11 is a cross-sectional view showing a welding process of the current collecting terminal and the reverse plate in the method for manufacturing the sealed battery in FIG. Referring to FIG. 11, also in this embodiment, reversing plate 41 and current collecting terminal 51 are joined by irradiating laser beam 110 to the bottom of hollow 45 through hollow portion 36.

図１１中に示す密閉型電池の構成部品の寸法の一例は、以下のとおりである。
嵌合部４４の深さＰ＝０．５ｍｍ
窪み部４５の底部分の厚みＱ＝０．３ｍｍ
凸部５２の直径φＲ＝２．０ｍｍ
嵌合部４４の直径φＳ＝２．２ｍｍ
このように構成された、この発明の実施の形態２における密閉型電池によれば、実施の形態１に記載の効果を同様に奏することができる。また、溶接部６１における厚み方向の溶接代をさらに容易に確保することができる。 An example of the dimensions of the components of the sealed battery shown in FIG. 11 is as follows.
Depth P of fitting part 44 = 0.5mm
Thickness Q = 0.3 mm at the bottom of the recess 45
Diameter of convex part 52 φR = 2.0 mm
Diameter of fitting part 44 φS = 2.2 mm
According to the sealed battery in the second embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained. Moreover, the welding allowance of the thickness direction in the welding part 61 can be ensured still more easily.

今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。   The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

この発明は、主に、電流遮断機構を備える密閉型電池に適用される。   The present invention is mainly applied to a sealed battery having a current interruption mechanism.

１０ 密閉型電池、１２ 電池要素、１４ 外装体、１５ ケース、１６ 封口体、１７，５５，８１ 貫通孔、２１ 外部端子、２１Ｎ 負極端子、２１Ｐ 正極端子、２３ インシュレータ、２５ ガスケット、３１ 中空リベット、３２ 第１鍔部、３３ 筒部、３４ 第２鍔部、３５，４２ 外周縁部、３６ 中空部、４１，１４１ 反転板、４３ 傾斜部、４４ 嵌合部、４５ 窪み部、５１，１５１ 集電端子、５２ 凸部、５３ 周縁部、５３ｐ 肉厚部、５３ｑ 肉薄部、５４ 切り欠き部、５６ 板状部、５７ 樹脂ホルダー、５７ｊ 基台部、６１ 溶接部、６２ 頂面、６６ 溶融部、１０１ 中心軸、１１０ レーザ光。   10 Sealed Battery, 12 Battery Element, 14 Case, 15 Case, 16 Sealing Body, 17, 55, 81 Through Hole, 21 External Terminal, 21N Negative Terminal, 21P Positive Terminal, 23 Insulator, 25 Gasket, 31 Hollow Rivet, 32 1st collar part, 33 cylinder part, 34 2nd collar part, 35,42 outer periphery part, 36 hollow part, 41,141 inversion plate, 43 inclination part, 44 fitting part, 45 hollow part, 51,151 collection Electrical terminal, 52 Convex part, 53 Peripheral part, 53p Thick part, 53q Thin part, 54 Notch part, 56 Plate-like part, 57 Resin holder, 57j Base part, 61 Welded part, 62 Top face, 66 Melted part 101 central axis, 110 laser light.

Claims (1)

電流遮断機構を備える密閉型電池であって、
電池要素を収容する外装体と、
前記外装体内において前記電池要素に接続される集電端子と、
前記外装体の外部に連通する中空部を形成する中空部材と、
前記集電端子および前記中空部材の間に配置され、前記外装体の内圧が所定以上に上昇した時に変形することにより、前記電池要素と、前記外装体の外部に設けられた外部端子との間の電流の流れを遮断する反転板とを備え、
前記集電端子は、
前記中空部材に向けて突出する凸部と、
前記凸部の周縁に沿って設けられる周縁部と、
前記凸部を取り囲むように前記周縁部に設けられ、前記凸部の突出方向において前記集電端子の厚みを減じるように形成される切り欠き部とを含み、
前記凸部は、前記凸部の突出方向において前記周縁部の厚みよりも大きい厚みを有し、
前記反転板には、前記凸部が嵌合される嵌合部が設けられ、さらに、
前記中空部材と対向する頂面を有し、前記凸部および前記嵌合部の間で、前記集電端子と前記反転板とを接合する溶接部を備え、
前記反転板は、前記反転板が前記凸部に向かい合う側で凹形状をなし、前記反転板が前記中空部材に向かい合う側で凸形状をなす窪み部を含み、
前記嵌合部は、前記窪み部がなす凹形状により構成される、密閉型電池。 A sealed battery having a current interruption mechanism,
An exterior body that houses the battery element;
A current collecting terminal connected to the battery element in the exterior body;
A hollow member forming a hollow portion communicating with the exterior of the exterior body;
Between the battery element and an external terminal provided outside the exterior body by being deformed when the internal pressure of the exterior body rises to a predetermined level or more, disposed between the current collecting terminal and the hollow member. And an inversion plate that cuts off the current flow of
The current collecting terminal is
A protrusion protruding toward the hollow member;
A peripheral edge provided along a peripheral edge of the convex part;
A cutout portion provided at the peripheral portion so as to surround the convex portion, and formed to reduce the thickness of the current collecting terminal in the protruding direction of the convex portion,
The convex portion has a thickness larger than the thickness of the peripheral edge in the protruding direction of the convex portion,
The reversing plate is provided with a fitting portion into which the convex portion is fitted, and
It has a top surface facing the hollow member, and includes a welded portion that joins the current collecting terminal and the reversing plate between the convex portion and the fitting portion ,
The reversing plate includes a recess having a concave shape on the side where the reversing plate faces the convex portion, and a concave portion on the side where the reversing plate faces the hollow member,
The fitting part is a sealed battery configured by a concave shape formed by the hollow part .
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